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I've been squinting and turning it round, improving the pics, looking at it from the inside to try to see through the iridescence, I can just about see what you mean on the pics, but can I see it on the vase? Don't be daft...

I'll try again in daylight tomorrow with a strong loup and see what I can see then...

I've looked through the likely suspects, Ditchfield/Glasform, Heron, Isle of Wight, Okra, even when I thought the quality or thickness of glass not quite right (cos everyone likes a nice surprise...) , and I can't find the colour or the shape.